NUMBER-OF-ROTATION DETECTOR

摘要

PURPOSE:To enable operation even in a power source cut-off state, by driving a magnetic bubble element by the permanent magnet mounted on a rotary shaft. CONSTITUTION:A permanent magnet 2 is mounted on a rotary shaft 1 to integrally revolve along with the shaft 1 and the magnetic bubble of a magnetic bubble element 3 is transmitted through a rotary magnetic field formed corresponding to the rotation of the magnet 3 along with the shaft 1 to detect the number of rotations of the shaft 1. By this constitution, a number-of-rotation detector always obtaining output corresponding to the number of rotations even in a power source cut-off state is formed.